Heat transfer dye providing material

A heat transfer dye providing material having on a support a dye providing layer containing a heat migrating dye represented by following formula (I):

• ##STR30## where R.sup.1 and R.sup.2 each independently represents a hydrogen atom, an alkyl group, an aryl group, or a heterocyclic group;
• R.sup.3, R.sup.4, R.sup.5, R.sup.6, and R.sup.7 each independently represents a hydrogen atom or a non-metallic substituent;
• and Za, Zb, and Zc each independently represents --N.dbd. or ##STR31## wherein R.sup.8 represents a hydrogen atom or a non-metallic substituent, at least one of said R.sup.7 and R.sup.8 is an aryl group or a heterocyclic group each having a substituent at an ortho-position to the position bonded to the nitrogen-containing ring of formula (I);
• and said R.sup.3 and R.sup.4, said R.sup.4 and R.sup.1, said R.sup.1 and R.sup.2, said R.sup.2 and R.sup.5, and/or said R.sup.5 and R.sup.6 may combine with each other to form a ring structure;
• and when Za and Zb in formula (I) represent carbon atoms substituted by R.sup.8 groups, those R.sup.8 groups may combine with each other to form a ring structure.